Abstract:Four aerogels with different molar ratios of ligand to metal ion were prepared by sol-gel method using 2-aminoterephthalic acid (NH2-BDC) as ligand and zirconium tetrachloride as Zr4+ source. The structure and photoelectric properties of the materials were characterized by SEM, BET, FTIR, XPS, UV-Vis and fluorescence spectroscopy. The results showed that the aerogels had a large specific surface area and rich pores and exhibited photoelectric effect under Xenon lamp irradiation. They could photocatalyze the reduction of CO2 to produce methanol in water. The effects of different molar ratios of ligand to metal ion on the photocatalytic reduction of CO2 were investigated under 300 W Xenon lamp irradiation. When the photocatalytic reduction of CO2 was performed for 4 h over the aerogel which actual ratio n (NH2-BDC): n (Zr4+) is 1.10∶1, the methanol yield was 3.94 mmol/g-cat and the corresponding turnover frequency (TOF) was 2.41 h-1. While the methanol yield and TOF over NH2-UiO-66(Zr) was 2.33 mmol/g-cat and 1.80 h-1 under the same reaction conditions. In addition, the aerogel had good photocatalytic stability.

Abstract:Energy and environment are two principle themes in the 21st century, the research and development of large-scale energy storage technology and devices is becoming increasingly important. Electrochemical energy storage (EES) has attracted extensive attention due to its high energy density and no special requirement for geographical conditions. Electrochemical flow capacitors (EFC) is an important representative of EES due to they have both advantages of high energy of the flow batteries and the high power density of supercapacitors. Semi-solid flow electrodes are the core part of this type of devices. Nevertheless, their microstructure is relatively complex, usually involving cross-scientific issues such as rheology, interface chemistry, and electrochemistry, and so on, which is the focus of current research. This paper reviewed the study progress of the design of EFC’s electrode microstructure and device, characterization and testing methods, and further discussed the key scientific issues and important research directions for future research.

Abstract:As stimulus-responsive materials, thermochromic ones have been applied to different fields, such as temperature sensors, smart windows, color-changing paints, displays, smart textiles and anti-counterfeiting, which have attracted wide attentions. Among them, inorganic thermochromic materials usually contain heavy metallic species (ions/atoms), which are commonly toxic and hence unfriendly to the environment; while organic small molecule thermochromic materials are easily bleached due to unstable structure in practice use. In contrast, polymer thermochromic materials have demonstrated several advantages including low costs, good stability, easy preparation and processing, as well as modifications, leading to considerable attention. Generally there are five types of thermochromic polymers with different working mechanisms, including conjugated polymers, supramolecular polymers, gels, photonic crystals, and liquid crystals. This review focuses on the latest advances related to these thermochromic polymers, and summarize and discuss their different thermochromic mechanisms and potential applications. Finally, the problems and challenges currenly faced in applying such thermochromic polymers are disscused, and the future research directions are prospected.

Abstract:In recent years, graphene oxide composite adsorbents have been widely studied in wastewater treatment. The composite materials composed of graphene oxide and natural polymers have the advantages of strong adsorption capacity, good mechanical stability, etc. And the surface modified graphene oxide can further improve its adsorption stability and adsorption capacity. In this paper, the preparation methods of graphene oxide/natural polymer composite adsorbents are introduced. The effects of functional groups of graphene oxide such as sulfhydryl, amino and carboxyl on adsorption properties are summarized. Graphene oxide/natural polymer composite adsorbents are prepared by graphene and chitosan, cellulose, sodium alginate and lignin. Furthermore, the applications in water treatment of dyes and heavy metals are reviewed. Finally, the development direction in the practical application on the outlook is put forward.

Abstract:As a versatile platform compound connecting biomass resources and chemical industry, 5-hydroxymethylfurfural (HMF) has very active chemical properties due to its aldehyde group and hydroxymethyl group. The catalytic oxidation process based on HMF is very important for biomass conversion which has attracted the attention of many researchers in recent years. The oxidation products of HMF, such as 2, 5-diformylfuran (DFF) and 2, 5-furandicarboxylic acid (FDCA), are fine chemicals with high value-added which can be used in antibacterial agents, pharmaceutical intermediates, synthetic polyester and other aspects. On account of low cost, abundant resources and environmental friendliness, non-noble metal catalysts have been gradually reported in the selective oxidation of HMF. The mechanism of HMF selective oxidation is described and different HMF catalytic oxidation systems in recent years are summarized based on non-noble metal catalysts. Finally, the research prospect of HMF selective oxidation is prospected which provides the basis and ideas for the construction of green and efficient catalytic system.

Abstract:The deep area of photocuring system can't be radiated by light, which usually results in low conversion rate. Several commonly used methods to solve the problem are described, including conventionally increasing monomer function, adding crosslinking agents, and improving photoinitiator system. In addition, some new methods such as up/down-conversion luminescence, visible/infrared photocuring and two-photon curing are introduced. The advantages and disadvantages of each method are summarized to provide direction for future scientific research.

Abstract:Nano-oxides with special sizes and structures can effectively fill the microcracks and pores of epoxy resin that formed by local shrinkage during the curing process. Besides, the mechanical property of epoxy coating can be significantly enhanced by intrinsic high hardness of nano-oxides, which thus are widely applied in the field of coating protection. In this paper, based on the latest research progress at home and abroad, the characteristics of nano-oxides, e.g. silica, titanium dioxide, zinc oxide, alumina oxide and ceria oxide, and their applications in epoxy coating were reviewed, including summarizing the structure and performance characteristics of various nano-oxides, comparing the different modification effects of different nano-oxides, and discussing the strengthening mechanisms of coatings in detail. Finally, the future development trend of nano-oxides in anti-corrosive coating is prospected.

Abstract:Recently, inorganic hybrid pigments have become one of the research focuses in the field of inorganic pigments. Clay minerals are abundant, cheap and readily available natural nanomaterials, and have become ideal carrier materials for building various inorganic hybrid pigments due to their unique nanoscale, bar-shaped and tubular structures. The structural characteristics of clay minerals are introduced. The research and application progress on clay mineral-based cobalt blue, bismuth yellow, iron red and other color hybrid pigments are also reviewed. Finally, the future development direction of clay mineral-based inorganic hybrid pigments is prospected.

Abstract:Wearable strain sensors have great application prospects in the emerging fields of human motion detection, health monitoring, wearable electronic devices and flexible electronic skin. In recent years, the wearable piezoresistive strain sensors, which are composed of two-dimensional (2D) conductive materials and flexible polymer substrates, have attracted wide attention due to their high sensitivity, good stretchability and flexibility, excellent durability, adjustable strain sensing performance and easy processing characteristics. Based on these, this work reviewed the classifications, sensing mechanisms, performance indexes, influence factors and applications of wearable piezoresistive strain sensors based on 2D conductive material/flexible polymer composites (2D-CPC). Finally, the future development trend of the strain sensors is also prospected.

Abstract:CuO-CeO2 Nanocomposites were prepared by hydrothermal synthesis using Ce(NO3)3?6H2O and Cu(NO3)2?3H2O as raw materials and NaOH as precipitant. The materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope(TEM), Uv-visible absorption spectrum (UV-vis), X-ray photoelectron spectroscopy(XPS) and specific surface and aperture distribution measurement technique. The researches shows that compared with pure CeO2, CuO-CeO2 has a smaller particle size of 10~40 nm, and a larger specific surface area 38 m2/g. CuO-CeO2 has a good gas-sensitive response to acetone, and its sensitivity to 100 mg/L acetone is 95, which is 43 times higher than that of pure CeO2. The mechanism of enhancing gas sensing properties was discussed in detail, which is attributed to the increase of specific surface area of CuO and CeO2 compound and the formation of p-n heterojunction at the interface between CuO and CeO2.

Abstract:Durable superhydrophobic coatings were prepared on paper substrate by a solution-spraying method using polydimethylsiloxane (PDMS) and silicon dioxide nanospheres (SiO2) doped poly(fluoreneyl ether ketone) (PFEK). When the doping amounts of PDMS and SiO2 were both 2 wt.%, the water contact angle (WCA) of the coating was 170? and the sliding angle (SA) was 1?. From scanning electron microscope (SEM) it can be seen that the SiO2 was anchored on the surface of paper fiber by the polymer binder; the coating showed micro-nano scale roughness. According to the Cassie model, it can be inferred that the superhydrophobicity was arisen from the air accumulated under such rough surface, which suppresses the water infiltration. The WCA of the PFEK/PDMS/SiO2 coated paper was 152? after 40 cycles of wearing tests and 151? after 12 times of folding tests, suggesting that the PFEK/PDMS/SiO2 coating has excellent mechanical stability. The PFEK/PDMS/SiO2 coating enhanced the tensile strength of the paper from 10.1 MPa to 30.9 MPa, and the tensile strength was maintained after the paper was immersed in water for 15 minutes. In addition, due to its superhydrophobic property, dust and other contaminants can be easily removed by the falling water droplets, thus providing a self-cleaning surface. Moreover, the PFEK/PDMS/SiO2 coated paper can resistant the contamination of viscous mud. Therefore, the PFEK/PDMS/SiO2 coated paper is expected to have a broad application prospect.

Abstract:Laponite as crosslinking agent, graphene oxide (GO) as photothermal conversion reagent, near-infrared light (NIR) responsive hydrogel (Laponite-PNIPAM/GO) was prepared by insitu N-isopropylacrylamide (NIPAM) polymerization. Firstly, the effects of the content of Laponite on the breaking elongation and tensile strength of Laponite-PNIPAM hydrogel were investigated, and the influence of GO content on the mechanical properties of Laponite-PNIPAM/GO hydrogel were investigated to determine the appropriate content of Laponite and GO. Subsequently, thevolume phase transition temperature (VPTT) and NIR responsiveness of the prepared hydrogel were characterized, and the application of Laponite-PNIPAM/GO hydrogel in light-controlled fluid switch and light-controlled desorption was preliminary explored. The results show that: Laponite-PNIPAM/GO hydrogel has high strength and good toughness, the elongation at break can reach over 1100%, and the VPTT of Laponite-PNIPAM/GO hydrogel was about 36 ℃; under NIR irradiation, Laponite-PNIPAM/GO hydrogel can be heated from 20.3 ℃ to 48.5 ℃ within 3 minutes; due to Laponite-PNIPAM/GO hydrogel has temperature sensitivity and photothermal effect, and it has the potential as light-controlled adhesion reagent and fluid switch.

Abstract:Phase change material composite with enhanced thermal conductivity were synthesized by sol-gel method using polyethylene glycol (PEG) as phase change material, 3-aminopropyl triethoxy grafted silicon dioxide (SiO2) as supporting material and oxide carbon nanotube(O-CNTs) as thermal conductivity reinforcer. The structure and morphology of PEG/APS-SiO2/O-CNTs composite were characterized by FTIR, SEM,XRD and DSC. When PEG content was 82.0%, the composite PCM still had good form-stable effect, and the enthalpy of melting and crystallization reached 134.2J/g and 126.6J/g. More importantly, the PEG/SAM composite retained good thermal properties after 500 melting and cooling cycles, the enthalpy decreased by only 3.3%. Compared with the PEG, the thermal conductivity enhancement rate of the composite with 0.6% O-CNTs was 28.1%，up to 0.41 W/(m?K). The infrared thermal imaging results show that the energy storage efficiency of the composite phase change materials is obviously improved.

Abstract:Manganese based compounds with high capacity, high energy density and high operating voltage are the preferred cathode materials in the commercial application of Aqueous Zinc-ion Batteries (AZIBs). However, the low conductivity, manganese dissolution, effect of electrostatic repulsion and poor structural stability of the materials seriously hinder their large-scale application. Carbon nanotubes (CNT) coated ZnMn2O4/Mn2O3 (ZMO/MO) composites were successfully synthesized via a facile surfactant-assisted solvothermal method, and the effects of CNT coating amount on the electrochemical performance and kinetic process of the materials were investigated. The structure and morphology of the materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Compared with pure ZMO/MO, the CNT coated cathode has better cycle stability and higher rate performance at 0.1 A g-1 current density. The kinetics characteristics of the electrode were investigated by cyclic voltammetry and electrochemical impedance. The diffusion rate of Zn2 was increased by Biphasic composites, and the charge transfer was improved by CNT coating.

Abstract:A fluorinated siloxane was prepared from methyl perfluoro (2-methyl-3-oxahexyl) fluoride (hexafluoropropylene oxide dimer) with N- (β-aminoethyl) -γ- aminopropyltrimethyl oxysilane (KH792), and its structure was confirmed by FTIR and 1H-NMR. Co-curing epoxy resin with fluorinated siloxane and polyetheramine to achieve molecular-level modification of epoxy resin. The various properties of the modified epoxy resin composite material were studied. The results showed that the addition of fluorinated siloxane increased the static water contact angle of the material surface from 72.0° to 103.2°, and the surface energy decreased from (42.08±2.17) mJ/m2 to (20.55±1.45) mJ/m2, the water absorption rate of the material was reduced from 1.75% to 1.38%, which effectively improved the hydrophobicity of the material. The dielectric constant was reduced from 3.83 to 3.63, the thermal decomposition temperature (T5%) of the material was increased from 339 °C to 347 °C, and the tensile and bending mechanical properties were increased by 8.5% and 7.7%, respectively. Since the fluorine element content was only 1% (mass percentage) of epoxy resin, the comprehensive performance of epoxy resin composites was the best. Studies by DSC and DMA showed that a small amount of modifier could promote the curing reaction of epoxy resin and improve curing degree and cross-linking density, when the addition of fluorinated siloxane increased, significant microphase separation occurred inside the material and the performance gradually decreased.

Abstract:Ti-Zr-O oxide were prepared by coprecipitation with zirconium nitrate and tebutyl titanate and then they were used as supports to prepare Mn/Ti-Zr catalysts by impregnation method. The catalysts were characterized by XRD, N2 physical adsorption, H2-TPR, NH3-TPD, and TG-DTA. The effects of the composition and structure of catalysts, as well as reaction conditions on the performances in methyl benzoate (MB) hydrogenation, as well as catalyst lifespan, deactivation, and regeneration of Mn/Ti-Zr catalysts were investigated. The results indicated that when TiO2 content and Mn loading in Ti-Zr-O support were12% and 8% (based on the mass of Ti-Zr-O oxide, the same below), the prepared catalyst had the best properties. This catalyst produced a high MB conversion of 98.0% and an integrated selectivity of benzaldehyde and benzyl alcohol at 89.7% under the optimized reaction conditions [T = 390℃, p = 1.0 MPa，n(H2)∶n(MB) = 9∶1 and weight hourly space velocity (WHSV) = 0.5 h-1). The activity and selectivity of Mn/Ti-Zr catalysts in the hydrogenation of MB were are related to the redox behavior of MnOx species on the surface of Mn/Ti-Zr and the acidity of the catalysts. Besides, the catalyst exhibited excellent structural stability with about 11% loss in activity after reaction for 1000 h due to deposition of heavy molecules and coke on its surface. The slightly deactivated catalyst could recover its initial activity and selectivity by simple calcination.

Abstract:Purpose: To use column chromatography to separate and purify cannabidiol (Cannabidiol, CBD) from hemp leaves, and to explore its application in depressive symptoms. Method: After pretreatment of hemp leaves, supercritical CO2 extraction was used to obtain hemp extract, and the resin was purified in two steps to obtain pure CBD. The establishment of chronic unpredictable mild stress model mice, through intragastric administration of CBD to explore their depression behavior and the influence of inflammatory factors. Results: The purity of CBD extracted by this method was as high as 99.18%; through animal experiments, the CBD dose group significantly improved the depression behavior of model mice (P<0.05;); the expression of TNF-α, IL-1β and iNos mRNA in the cortex and hippocampus of the model group was significantly increased (P<0.05;); the expression of TNF-α, IL-1β and iNos mRNA in the cortex and hippocampus of the CBD dose group were significantly decreased (P<0.05). Conclusion: The CBD prepared by this method has high purity. CBD can effectively improve the depressive behavior of mice and inhibit the inflammatory response in the cerebral cortex and hippocampus.

Abstract:In order to search for antibacterial compounds, the natural product osthol was used as raw material to prepare intermediate I by selenium dioxide oxidation, and then intermediate II was prepared by sodium chlorite oxidation. Finally, fifteen osthol amide derivatives were prepared by DCC condensation of intermediate II and amine. The structures of compounds were confirmed by 1H NMR, 13C NMR and MS. The results showed that these derivatives had potential antibacterial activities, most of the target compounds had better antibacterial activity than osthol, and some of them had excellent antibacterial activity against methicillin-resistant staphylococcus aureus (MRSA). Among them, compound Ⅲo showed the best anti-MRSA activity with the minimum inhibitory concentration (MIC) of 64 μg/mL, which was much better than that of oxacillin.

Abstract:1-(3-Hydroxypropyl)-4-piperidone was prepared from 3-hydroxypropylamine and methyl acrylate through Michael addition, Dieckmann cyclization and decarboxylation reaction under microwave irradiation. The technological parameters involved in Michael addition, Dieckmann cyclization and decarboxylation reaction were optimized. Structures of the target product and the intermediate were confirmed by 1H NMR and 13C NMR. The results show that n(3-hydroxypropylamine):n(methyl acrylate) = 1:2.4 reacted under microwave power 120W and 40℃ for 30min to give methyl 3-[(2-methoxycarbonylethyl)(3-hydroxypropyl)amino]propionate in 92.6%. 1-(3-Hydroxypropyl)-4-piperidone was obtained with the yield of 88.5% under the conditions of microwave power 200W and reflux for 20min and 25min in Dieckmann cyclization and decarboxylation reaction. The total yield of the target product was 81.9%.

Abstract:Based on the preparation of strawberry leaf water extract (SLWE), the composition, antioxidative activities and non-enzymatic glycosylation (NEG) inhibition rate of SLWE was explored. In addition, the effects of SLWE on the survival rate, hyaluronic acid (HA), collagen I (COL I) and hydroxyproline (HYP), matrix metalloproteinase 1 (MMP 1) and matrix metalloproteinase 9 (MMP 9) of normal growing human skin fibroblasts (HFF-1) were evaluated, in order to estimate the effect in delaying skin aging of SLWE. Through building UVB causes HFF-1 damage protection model, the effects of SLWE on reactive oxygen species (ROS), malondialdehyde (MDA), MMP-1 and superoxide dismutase (SOD) in the protection group were measured to explore the protective mechanism of SLWE on UVB-induced HFF-1 damage. The results showed that SLWE was rich in Vc, quercetin, chlorogenic acid, gallic acid and catechin, among which quercetin and epicatechin were 12.86 mg/L and 10.13 mg/L respectively. SLWE had good free radical scavenging ability, which was in order, O2-? > DPPH > ABTS > ferrous chelation > ?OH. The NEG inhibition rate of 1% (volume fraction) SLWE was 87.17%. More than 3% (volume fraction) SLWE could improve contents of HA, COL I and HYP (p < 0.05) in HFF-1, and 6% (volume fraction) SLWE could decrease the content of MMP 1 (p < 0.01), suggesting that SLWE was helpful to anti-aging through lifting the skin moisture, increasing the collagen content and inhibiting collagen degradation. In UVB causes HFF-1 damage protection model, SLWE could effectively ROS generated by UVB stimulation, 6% (volume fraction) SLWE could significantly reduce MDA, inhibit MMP-1 expression, and improve the activity of SOD, indicating that SLWE could help alleviate cell damage caused by oxidative stress.

Abstract:This paper aims to explore the preparation method and reaction mechanism of erythro aleuritic acid from thero configuration. Erythro aleuritic acid was prepared by configuration transformation method from thero aleuritic acid. And FTIR, mass spectrometry, nuclear magnetic resonance (1H/13C NMR), TG, DSC, XRD, chiral resolution and optical rotation were used to analyze and confirm the structure of reaction products. On these foundations, the transformation mechanism of thero aleuritic acid to erythro aleuritic acid was primary explored. The results showed that the structure of the product was consistent with thero aleuritic acid by FTIR, mass spectrometry. The results including NMR. XRD, DSC and TG show that the thero aleuritic acid and the product have the same crystal type, but the melting point of the product is higher and the crystal cell structure is smaller than thero configuration. The chiral resolution results showed that the product was an optical isomer of aleuritic acid, which was determined to be erythro aleuritic acid. Based on the structural characterization of the intermediates, the mechanism of the transformation from thero aleuritic acid to erythro aleuritic acid is the simultaneous reaction of SN2 and E2 between the halogens and the hydroxides. The twice SN2 reactions are the key to the configuration transformation reaction (Walden transformation). The E2 reaction of hydroxyl/halogen is the reason why thero aleuritic acid can be completely transformed into erythro aleuritic acid.

Abstract:In this work, the precursor NiFe-PBA (NF) was synthesized by a facile coprecipitation method, and then the NiFe-PBA nano-porous material (NFP) was prepared by solvothermal treatment. XRD, SEM, TEM, XPS, BET and electrochemical methods were used to characterize the structure and test the oxygen evolution performance of the synthesized materials. Electrochemical measurement results showed that compared with the precursor NF, NFP exhibited significantly enhanced electrocatalytic performance of oxygen evolution reaction (OER) due to the increase of electrochemical surface area and catalytic active sites. In 1 mol/L KOH aqueous solution, the NFP required an overpotential of only 260 mV to afford the current density of 10 mA/cm2, 18.75% lower than that of the NF (320 mV) precursor, which also outperformed many previously-reported noble-metal-free electrocatalysts and commercial noble-metal-based catalysts, indicative of a promising prospect for application.

Abstract:Spent grain is regarded as a natural adsorption material because of it is rough surface structure and functional groups. In order to realize the recyclization of the spent grain, etherified modified spent grain (MSG) for adsorbing methylene blue (MB) was prepared from raw spent grain (RSG) with NaOH as alkaline catalyst and chloroacetic acid as the etherifying agent. The effect of the modification parameters on the adsorption effect was investigated. The results showed that the adsorption of MSG reached maximum value with 201.20 mg/g, when the ratio of NaOH to ClCH2COOH was 2.5:2.0, etherification temperature was 75 ℃ and etherification time was 2.5 h. The morphology, specific surface area, pore size distribution and surface properties of RSG and MSG were analyzed by means of SEM, N2 desorption, FTIR, XPS and pHpzc. The absorption mechanism of MSG to MB dye can be well described by Langmuir equation and pseudo-second-order kinetic equation, indicating that chemical adsorption is the main adsorption method.

Abstract:Phenol-amine chelating resin based on tannin was prepared by the cross-linking reaction of polyethylenimine and chlorinated tannin, where chlorinated tannin was synthesized by the reaction of tannins with thionyl chloride. The phenol-amine chelating resin based on tannin was characterized by FTIR, SEM, EDS and XPS, and the adsorption properties of chelating resin based on tannin for Cr(VI) were evaluated. The adsorption properties of the chelating resin based on tannin were effectively improved owning to the introduction of the amino group into the side chain of tannin molecular structure. The adsorption of Cr(VI) by the chelating resin based on tannin is mainly reduction adsorption, which is mainly adsorbed on the resin in the form of Cr(III). The maximum adsorption capacity of the resin for Cr(VI) was 364.46 mg/g at 318 K and pH 2.0 when initial concentration of Cr(VI) was 500 mg/L, and the adsorption rate of resin to Cr was more than 95% when the initial concentration of Cr(VI) was lower than 20 mg/L. The adsorption process of Cr(VI) by the resin can be described by the Langmuir isothermal adsorption model and the pseudo second order kinetic equation. The resin has potential application prospects in the treatment of the wastewater containing chromium.

Abstract:Endowing hydrophobic polyester chopped fiber with hydrophilic properties can expand its application value. This article proposes that gallic acid and ethylenediamine are co-deposited on the surface of polyester chopped fibers by Michael addition or Schiff base reaction in alkaline Tris buffer. The dynamic contact angles of polyester chopped fibers before and after modification were measured, and the micro morphology of the fibers was observed by scanning electron microscope (SEM),Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) The changes in the surface structure of the fibers were characterized. Finally, the polyester chopped fiber and hardwood pulp were used to make paper before and after the modification. The pore size distribution changes and air permeability of the paper were measured, and the physical properties of the paper were tested. The results show that there are a large number of hydroxyl groups on the surface of the polyester chopped fiber after co-deposition modification, nitrogen is generated on the surface of the fiber, and the surface roughness is improved. Compared with the unmodified polyester chopped fiber, the modified polyester The contact angle between chopped fiber and deionized water is reduced by 57.2?, which significantly improves the hydrophilicity of the fiber. Compared with the unmodified fiber paper, the tensile strength of the modified fiber paper is increased by 35.2%, and the wet strength is increased by 43.3. %, the air permeability increased by 11.1%, the pore diameter increased by 24%-30% within the same pore diameter range, and the fiber dispersion was significantly improved. The results of this research can produce polyester fibers with excellent hydrophilicity and can be used in high-performance paper applications.

Abstract:The acrylate emulsion pressure sensitive adhesives (PSA) with a solid content of up to 62% were synthesized by unseeded semi-continuous emulsion polymerization technology using butyl acrylate (BA), methyl methacrylate (MMA), acrylic acid (AA) and 2-hydroxyethyl acrylate (HEA) as monomers, allyloxy fatty alcohol polyoxyethylene ether ammonium sulfate (SR-10) and alkyl polyoxyethylene ether succinate monoester disodium sulfonate (A-102) as hybrid emulsifiers. The effects of the amount of hard monomer MMA on the properties of the latex PSAs were investigated. Results indicated that when the amount of MMA accounts for 10% of the total monomer, the glass transition temperature (Tg) is -32.6 °C, the initial thermal decomposition temperature is 337 °C, the water contact angle is 108°, the loop tack is 9.53 N/25mm, the 180° peel strength is 10.08 N/25mm, and the shear holding power is more than 72 h; Compared with the high-solid emulsion without MMA, the viscosity of the emulsion decreased from 361 mPa·s to 155 mPa·s, the particle size decreased from 375 nm to 350 nm, and the particle size distribution index increased from 0.144 to 0.214.

Abstract:R-Glabridin is one of the unique isoflavones in glycyrrhiza glabra, which has a broad spectrum of biological activities. In this study, R-glabridin has been obtained via seven steps from 7-hydroxychromen-4-one by protection of phenolic hydroxyl groups, esterification of enol, Heck asymmetric coupling, deprotection, cyclization, reduction and demethylation and so on, the total yield was 23.5% and the ee value of the final product was 98.9%. The structures of products were confirmed by 1HNMR and MS. This method has the advantage of mild reaction conditions, easy operation and high yield.